New Roof Insulation Regulations

New insulation in rental properties needs to meet minimum r values.

New roof insulation regulations.

New zealand standard nzs 4246. Work to an existing roof. Insulation is measured by r value. Building regulations standards set the levels of thermal insulation required when carrying out building work either for new build or refurbishment projects.

How to meet the current insulation regulations. These are expressed as a u value which needs to be achieved. In most cases extra investment made in beating the building regulations on insulation is money well spent it gives a lot back in returns. As a roof is defined as a thermal element the work to re cover a roof should also include for improving the thermal insulation properties of the roof.

The minimum r value depends on which part of the country the property is in. Insulating a roof is perhaps the easiest of all the energy saving home improvements. You are replacing repairing more than 25 per cent of the roof area in which case the roof thermal insulation would normally have to be improved. Movement could cause cracks to occur in the walls and possibly the eventual collapse of.

Chimney flues roofing etc. The removal or alteration to any roof elements could affect how the roof works and cause movement to occur. A ventilation gap usually 50mm should be provided between the top of the insulation and underside of the roof covering to allow the air to flow across. R values are a measure of resistance to heat flow.